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A large population of laboratory animals has been allowed to breed randomly for a number of generations. After several generations, 25% of the animals display a recessive trait (aa), the same percentage as at the beginning of the breeding program. The rest of the animals show the dominant phenotype, with heterozygotes indistinguishable from the homozygous dominants.
-What is the estimated frequency of allele A in the gene pool?
A) 0.25
B) 0.50
C) 0.75

Question

Quizplus · Accepted Answer

Since the recessive trait is aa, we know that the frequency of the recessive allele (a) is 0.5 (square root of 0.25). Since there are only two alleles in the gene pool (A and a), the frequency of allele A can be calculated by subtracting the frequency of a from 1, giving us a frequency of 0.5 for allele A.

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